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Every active application-level Symphony vector may have an independently installable, out-of-process C++ engine. Shared authority-free C++ mechanics live under libraries/; a separate C++ coordinator owns authenticated-session and worktree-reconciliation mechanics. Engines inspect, validate, project, and propose within vector-owned contracts. They do not acquire authority merely by generating content.

Implemented engines

Knowledge Vector foundation

C++ process framing, JSON, SHA-256, snapshots, receipts, and manifest discovery.

Session coordinator

Authenticated sessions, worktree reconciliation, and lifecycle apply coordination.

SCV source engines

Eight C++26 SCV, hyperscaler, edge, and provider source-knowledge engines.

SHV engines

Hardware source, catalogue, profile, partition, publication, and adapter engines.

SKV engine family

The SKV surfaces each have their own engine:
  • SKVI, SCLV, SACV, SODV, and SSFV engines each implement inspect, check, propose, project (and recovery where applicable).
  • SAV and SEV engines are freezing-path C++26 processes for composition evaluation and evolution cases.
Every current SKV engine is read, query, validate, and propose only. Programmatic canonical apply remains disabled until each engine’s SSIAG permission verification, expected-state transaction, qxctl safeguard, STAV event, recovery, and negative-test contracts are complete.

Common guarantees

  • Independent installation and uninstallation per module
  • No ambient repository crawl; manifest discovery is explicit
  • No shared authority; every mutation route is gated by SSIAG plus STAV
  • No hot-path residency; engines never inject latency into live workloads

qxctl overview

Administrative CLI that invokes exact receipt-validated engines.

Maestro

Records docking relationships between engines and receptors.
Last modified on September 24, 2026